IIRC my HDML cloner box (which I use more for recording HDMI, and occasionally component and composite sources to USB than as an upscaler despite it being capable of that) will take a 4X3 composite input and convert it to a 16X9 HDMI output consisting of the composite signal in the center pillarboxed by black bars on either side...I can double check for you later tonight after dinner.
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